Doorbell



FIG. 1 is a front and side perspective view of a doorbell embodying the new design.

FIG. 2 is a back and side perspective view thereof.

FIG. 3 is a front view thereof.

FIG. 4 is a back view thereof.

FIG. 5 is a first side view thereof, the second side view being a mirror image.

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The dash-dot-dash lines represent the boundary of the claimed design. The uniform repeating broken lines showing surface features and the back of the design are included for the purpose of illustrating portions of the “article” and form no part of the claimed design. 

CLAIM The ornamental design for a doorbell, as shown and described. 